I wonder if GF means the Anonymous movement, which co-opted the use of the Guy Fawkes mask in the wake of this film?

That aside, I did very much enjoy this movie back in the day — the visual aesthetic, Hugo Weaving, and Natalie Portman all made it a fun watch for me. I’ve also got a soft spot for Guy Fawkes himself, after living in York and walking past his birthplace everyday.